Kilomill

Kilomill PNG to JPG

Convert PNG to JPG

Turn PNG images into JPG files, which are much smaller for photos and accepted by every upload form. Transparent areas are filled with a colour you choose.

  • No upload: runs in your browser
  • Batch + ZIP download
  • No sign-up, no watermark

Drop PNG images here

or paste from the clipboard · JPG, PNG, WebP, AVIF, HEIC, GIF, BMP · no upload

Output format
File size

For JPG, WebP and AVIF. 70–80 is hard to tell from the original. PNG uses smart colour reduction instead (see Advanced).

KB
KB

Aims at or below the maximum counting 1 KB = 1,000 bytes, so the file passes whether a site counts 1,000 or 1,024 bytes per KB.

Dimensions

Leave one box empty to keep the proportions.

%
px
Advanced
PNG output
dpi

Metadata (EXIF, GPS location, camera details) is removed from every output file.

When converting PNG to JPG makes sense

Your PNG is…Convert to JPG?
A photo (camera image, scanned picture)Yes. Typically several times smaller at quality 80.
A form or portal requirement says “JPG only”Yes. Combine with a KB target if there is a size limit.
A screenshot with text, a logo or a diagramUsually not. JPG blurs sharp edges; try Compress PNG instead.
An image with a transparent backgroundOnly if you don’t need transparency; otherwise use PNG to WebP.

Transparent areas

JPG has no transparency. Kilomill blends transparent and semi-transparent pixels onto a solid colour: white by default, or any colour under Advanced → Background for transparent areas. Pick the colour of the page or document the image will sit on, and soft edges will blend in naturally.

Questions and answers

Will PNG to JPG lose quality?

JPG is lossy, so a tiny amount of detail is discarded. At quality 80–90 photos look the same; sharp text and lines may show faint halos, which is why screenshots are better kept as PNG.

Why is my JPG bigger than the PNG?

That happens with simple graphics with few colours, which PNG stores very efficiently. Keep those as PNG.

Can I convert many PNGs at once?

Yes. Add them all, then use Download all (ZIP).

Are my images uploaded to a server?

No. The images are read and compressed by code running in this browser tab, and the results are created in your device’s memory. Nothing is sent anywhere, which you can confirm in your browser’s developer tools (Network tab) while you work. See Privacy.

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